iio: imu: st_lsm6dsx: export max num of slave devices in st_lsm6dsx_shub_settings

Export max number of slave devices supported by the i2c master
controller in st_lsm6dsx_shub_settings data structure.
This is a preliminary patch to support i2c master controller
on lsm6dsm sensors
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h

@@ -176,6 +176,7 @@ struct st_lsm6dsx_hw_ts_settings {
  * @pullup_en: i2c controller pull-up register info (addr + mask).
  * @aux_sens: aux sensor register info (addr + mask).
  * @wr_once: write_once register info (addr + mask).
+ * @num_ext_dev: max number of slave devices.
  * @shub_out: sensor hub first output register info.
  * @slv0_addr: slave0 address in secondary page.
  * @dw_slv0_addr: slave0 write register address in secondary page.
@@ -187,6 +188,7 @@ struct st_lsm6dsx_shub_settings {
 	struct st_lsm6dsx_reg pullup_en;
 	struct st_lsm6dsx_reg aux_sens;
 	struct st_lsm6dsx_reg wr_once;
+	u8 num_ext_dev;
 	u8 shub_out;
 	u8 slv0_addr;
 	u8 dw_slv0_addr;

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c

@@ -883,6 +883,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 				.addr = 0x14,
 				.mask = BIT(6),
 			},
+			.num_ext_dev = 3,
 			.shub_out = 0x02,
 			.slv0_addr = 0x15,
 			.dw_slv0_addr = 0x21,
@@ -1257,6 +1258,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 				.addr = 0x14,
 				.mask = BIT(6),
 			},
+			.num_ext_dev = 3,
 			.shub_out = 0x02,
 			.slv0_addr = 0x15,
 			.dw_slv0_addr = 0x21,

drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c

@@ -30,7 +30,6 @@
 
 #include "st_lsm6dsx.h"
 
-#define ST_LSM6DSX_MAX_SLV_NUM			3
 #define ST_LSM6DSX_SLV_ADDR(n, base)		((base) + (n) * 3)
 #define ST_LSM6DSX_SLV_SUB_ADDR(n, base)	((base) + 1 + (n) * 3)
 #define ST_LSM6DSX_SLV_CONFIG(n, base)		((base) + 2 + (n) * 3)
@@ -770,7 +769,7 @@ int st_lsm6dsx_shub_probe(struct st_lsm6dsx_hw *hw, const char *name)
 		if (err < 0)
 			return err;
 
-		if (++num_ext_dev >= ST_LSM6DSX_MAX_SLV_NUM)
+		if (++num_ext_dev >= hw->settings->shub_settings.num_ext_dev)
 			break;
 		id++;
 	}